Machine for drawing threads in fabrics



0d 16,1934 L HgcoRRALL ET Al. 1,977,573

V y v MACHINE FOR DRAWING THREADS IN FABRICS K Filed March 19, 1932 i 3 Sheets-Sheet l Oct. 16, 1934. H; coRRALl. -r AL I 1,977,573

MACHINE FOR DRAWING THREADS IN FABRICS Filed March 19. 1952 3 sheets-sheet 2 Flc., le. FIG' I4 www Herbcrr/ CorraZZ "3 James Heyyz' sw LHJ'M OC- 16, 1934- vl-l. coRRALL ET' AL MACHINE FOR DRAWING THREADS IN FABRICS Filed Marcnl. 1932 s Smets-sheet 3 .4 i ,f ,5

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gwoon/ww Herlaerf CorraZZ mg James Heyae @3W '5 amovable thread-cutting blade below-the'throat-` i i L sition tothe action-cfa U-shaped wire spring 16,v

Patented Oct. 16, 1934 mennen Fon DRAWING THREADS: 1N n .fhmmcs l "`jHerbertcorralnneleshurgmaii Jais nggi, VClydebank,'Sc'itlantL4 assignors to ,The Singer" `A`lvlanufzwturingCompany;Elizabeth,fN;Jaja I corporation of New' Jersey ,f Applicants. ivmvmyhl-19., 1932, seal, .Nal ssjscs .In Great v Britain 4April-,8, v1931 .y Vicki-img.. 1?,.(Cl1f 1,.

- This invention relates to machines-for 4drawing threads in fabrics; ofthat class .having ka ledger blade tted to the throat-plate, a presser bar and a' piercer bar above ,the throat-plate, and

plate. i

The machine according'to 'the invention is equipped :with fabric-feeding'l mechanism' comprising lfeed-dogs spring-urged towards one an# other and movableV apart by theaction yof a'cam orwedgein the advance feeding movementaof' said feed-dogs. .Y Y A.

' -The feed-.dogs are carried by bars or `levers pivoted at their ends adjacentto the operator and 1.15 provided at their opposite-ends :with followers engageable with a cam or wedge.

. -fIlhe ledger blade; accommodated in a recess the throat-plate and supported atfits vends only,4 is engaged intermediate its ends by the heads of qopscrews threaded into apertures in A.the throatplate, so that by adjustment ofi these'screwsrthe blade maybe iiexed between its pointsof vsupport to vary the level of its cutting-edge. f v The invention is illustrated the-accompanying drawings in which Figs. 1 and 2 4arf-:vertical sections inthe line of feedvat'ithe thread-draw-` ing-station, the'throat-p1ate-and the feeding mechanism in these figures' being'in section, red` spectively, on'the lines a-c and b-b of'FigJB;

Fig.` 3 is av plan view of the"mechanisrn'below` the throat-plate; Fig. 4 isfa vertical sectionrat'vright 1v angles to Figs'.` 1 and-12, the :throat-plate being in? section, on the line c-c of Fig. 5. Fig. 5 is adetail plan'view of thethroat-plate with the feed- .dogs projecting upwardly-.through slots in the latter; Figs. 6 and 7 are vertical sections also on the lines a-a and b-b, respectively, of Fig. 5; Fig. 3 is a vertical transverse section also on the line c-c of Fig. 5; Figs. 9-15 are detail views of .mgthe components of the feeding mechanism; Fig.

16 is a plan view of the presser foot.

Referring to the drawings, 1 denotes the usual serrated piercer blade carried by the vertically reciprocating piercer bar 1, 2 the presser foot,

f3 the throat-plate, 4 a rotary thread-cutter beneath the throat-plate 3, 5 two feed-dogs which project upwardly through slots 5 in the throatplate 3, 6 the feed rock shaft and 7 the feed lift rock shaft.

5g j The feed-dogs 5 are unitary with the feed-bars or levers 8 pivoted at 9, at the ends adjacent to the operator, to a carrier frame 10 pivotally connected at 11 to arms 12 unitary with the feed rock shaft 6. Rollers 13 mounted one on the end `j1jpf each feed-bar or lever 8 remote from the pivot 9 are engageable with divergent faces 14 present` edbyracam `15 secured tothe underside of the throat-plate: 3, rwhereby the levers l8 and therewith'the feed-.dogsare-spread further apart 4in the advance .movement of the feed-dogs, in oppo-I so .aszto eiectzstret-chingof. the fabric in the di rection transverse to the line of feed.- The spring 1.6 is heldin position under :a lug I7. unitary with a keeper plate 18 penetrated'by the pivots 9.. `The 555 levers 8 are unitary with arms 'guided between` the :keeperwplate-'184 and the-frame `10 and'with toes=82-movable ingu`idewaysv 19 defined betweenv the upperface of the frame 10 and the undercut ends of a plate'20 securedto the frame. v'I'he ends 701 of the frame. 11'6 adjacenttothe shaft 7 rests upon a roller *21" carried lby'an arm 22 secured to the shaft 7; a ltensionspring.23 being provided to maintainthe `frame-110 in' engagement with the roller21'.` l .Theledger blade 24 'is constituted as a blade springha'ving 'ai rbifurcated operative end overlying a cut-"away'lS'in the throat plateland present-A ing aicuttng *edgev 25 flanked by prongs 26-which arecontacted'by the lateral portions of the-broad 30 cutting edge offthe-cutter4 before said broadv cutting edge cooperates withthe edge 25. The blade-24 'is vaccommodated in a recess 27 in the throat "plate and supported at its ends only. The prongs 26 restonr-thatedge o'f'the cut-away 3''35 remote ffrom'the operator and the.- end of the blade adjacent to'- the. operator'is" anchored to the throat'plate by a screw 28 penetrating a slot. 2.9-.in the blade -`24.l 'By adjustment.4 of screws 30. threadedjntoiapertures in the throatv plate, .one 90 at each side of the blade 24 intermediate the ends thereof, with their heads engaging the blade, the blade may be exed between its points of support so as to bring its cutting edge 25 into correct position for cooperation with the cutter L 4. By slackening the screw 28 the blade 24 mayV be adjusted in a direction transverse to its cutting edge 25 to bring said cutting edge into correct position relatively to the cutter 4. The cutaway 3 is so dimensioned as regards width with 100 respect to the blade 24 that gaps 31 are afforded between the lateral edges of the cut-away and the blade 24. In vertical register with the gaps 31 and projecting thereinto are reflex wire springs 32 carried by the presser foot 2 and adapted to 105' maintain under tension the cross threadsV of the draw. Y

The presser foot 2 is of skeleton form,` being universally connected to a bracket 33 on the presser bar 33 by means of a forked bracket 34 pivotally connected at 35 to the presser foot and at 36 to the bracket 33.

In the interest of clarity of illustration the usual serrations on the upper surface of the throat plate, within the-areaindicated at (Fig.

5), are not shown.

As is understood, in operation, thecutter 4 performs one rotation for each feeding movement and the piercer blade l in its descent depresses path of the rotary cutter 4 which severs said ,threads in cooperation with the ledger blade..

What is claimed isz-I 1. In a thread-drawing -machine`, in combinal5 tion, a throat-plate, a flexible ledger blade fitted to the throat-plate, said ledger blade supported at its ends only and having a-cutting edge, a ymov- V able thread-cutting blade below said throat-plate,

and means for flexing said ledger blade interledger blade intermediate its` ends to vary the,

level of its cutting edge.

3. In a thread-drawing machinain combina tion, a throat-plate formed in its upper face 'with a recess and with a cut-away, a flexible-'ledger 355 blade securedat one end to said throat-plate and overlying said recess, said ledger-blade supported by said throat-plate at its opposite end and having a cutting edge overlying said cut-away, screws threaded into said throat-plateand engageable 463 with said ledger blade above the recess for flexing` said ledger blade intermediatev its ends,and a movable thread-cutting blade below said throatplate co-operating with said ledger blade.

4. In a `thread-drawing machine, a throat- 453 plate, a vertically reciprocatory piercer, a ledger blade, a movable thread-cutting blade vbelow said throat-plate cooperating with .saidl ledger blade,l work-advancing feed-dogs spaced crosswise' of *the direction of feed of the work, a feed-bar pivotal- 5'53 lysupporting said feed-dogs for vibratory move-j ments Vtoward and from each other about substantially vertical axes, means for actuating said feed-bar, guiding means upon said feed-.bar confining said feed-dogs against 'sidewise tilting movements, means beneathsaid throat-plate for and work-presser means.

wedging said feed-dogs apart in their work-advancing movements, a U-shaped spring embracing said feed-dogs and yieldingly urging the feeddogs VHtowards one another, and workepresser means opposed to said feed-dogs.

5. In a thread-drawing machine, a throatplate; a ledger blade tted to said throat-plate,

a lvertically reciprocatory piercer, a movable thread-cutting blade below said throat-plate cothe longitudinal threads of. .the""draw` into the,

operating with said ledger blade, a feed-bar below said throat-plate, means for actuating said feedbar, laterally.. spacedfeed-dog carrying levers ends o-fsaid levers to conne the feed-dogs against sidewise tilting movements, means carried by one of said keeper plates for yieldingly urging said levers intofeed-.dog approaching movements,

and work-presser means.

j .6. InV av thread-drawing machine, 1a. throatplate Aprovided with a .piercer opening and with feed-dog slots at opposite sides of said piercer opening, a ledger bladettedto. said throat-plate and having a `.cutting edge insaidpiercer opening, a vertically reciprocatory piercer, a movable; thread-cutting blade below said throat-plate cooperating with said ledger blade, a feed-bar below said throat-plate, means for actuating said feed-g bar, `laterally spaced. feed-dog carrying levers each pivotally secured at one end to said feed.`

bar, a cam secured upon the under sideof said: throat-plate having divergent wedge-faces-disposed rearwardly of said throat-plate piercer aperture, followers carried by said feed-dog carrying levers at their ends opposite to the pivoted ends thereof for engagement. with said wedge faces, a` spring yieldingly urging the follower.

other,

carrying ends of saidlevers toward each '7. In` a: thread-,drawing machine, a throatplate formed with a cut-away, a ledger blade having a cutting edgeoverlying said cut-away, a

movable thread-cutting blade below said throat-v plate cooperating with said ledger blade, and

means for securing saidledger blade upon said throat-plate for adjustment of the cutting edge of said ledger blade in said cut-away in a plurality of directions transverse to said cutting edge and to each other. i

' HERBERT .CORRALL JAMES HEGGIE. 

